i>80 INDEX. 



Xanthin, preparatior of, 175 Yeast-cells, nuclein prepared from, 88 

 reactions for, 176 



derivatives of, 184 Zinc lactate, 126 



,, physiological action of, 185 ,, sarcolactate, 127 



Xanthokreatinin, 207 Zymogen, an antecedent of the enzymes, 



Xanthophane, 261, 263 56 



Xauthoproteic reaction for proteids, 7 ,, of pepsin, 61 



Xanthopsin, 264 ,, of trypsin, 64 



Zymolysis, 53, note 



Yeast-cells, early observations on, 72, phenomena of, 75 



73 ,, heat phenomena of, 75 



